=== Olivia Mears (voiced by Liliana Mumy) is a minor villain and also Haley Long's arch-enemy that appears in American Dragon: Jake Long series and Alvin and the Chipmunks 3: School Bully. When a black Toyota van explodes at the South Korean consulate in Los Angeles, Simon Seville (Matthew Gray Gubler) is assigned to the case, which becomes personal when it is discovered that it somehow involves Olivia Mears, the former partner of Simon Seville's deceased biological father. Olivia, who was suspected, but never proven of having role in the death of Simon Seville's biological father, is now leader of the Italian American mafias. The Los Angeles Police Force, led by Jeanette's older sister, Brittany Miller (Christina Applegate) soon get into an argument over the jurisdiction of the case. Simon, believing Olivia is the head of the operation, learns that Olivia will be attending a dinner party on her yacht. Olivia scolds her right-hand man Eli Pandarus (Jonathan Freeman), who then leaves as both Simon and his girlfriend Jeanette (Anna Faris) confront Olivia. However, Olivia claims that somebody is trying to frame her. Pandarus suddenly appears from behind and shoots Olivia, making him escape in the chaos; and a furious Brittany holds Simon responsible for Olivia's death and orders him off the case. However, it was actually revealed that Olivia faked her death as Simon suspected. Near the end of the film, Simon then arrives and confronts Olivia, shortly before Jeanette arrives. Following a tense standoff, Olivia admits she killed Simon's unnamed biological father and Jeanette encourages her boyfriend Simon to shoot her. As Olivia tries to break free from Simon's grip, Simon kicks her and accidentally sends her crashing through the open window, where she plunges to her death onto the roof of a parked school bus. She made a cameo appearance as one of Alvin Seville's queen cards alongside Councilor Chang, Maleficent, Ursula, Morgana, Cruella De Vil, Lady Tremaine, Anastasia Tremaine, Yan Yan, Drizella Tremaine, and the Evil Queen in Alvin and the Chipmunks 3: Theodore's Unbound.

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